ipc: icbmsg: Add support for POSIX arch targets #78109
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Add support in this IPC backend for POSIX arch targets in general, and ensure the nrf5340bsim defines the buffer which will be used.
Fixes #78099
Note: This is not working yet, it builds, it does not crash, but BT fails to init in some runs but not others..Update: It seems to fail depending on the content of the memory used for the communication at boot (If I clear it to 0 at boot it works fine. If it is just whatever garbage it can fail. Is that a bug in this backend?)